Abstract
The main aim of studies on dynamic behaviour of construction materials at high strain rates is to determine the variation of mechanical properties (strength, plasticity) in function of the strain rate and temperature. On the basis of results of dynamic tests on the properties of constructional materials the constitutive models are formulated to create numerical codes applied to solve constructional problems with computer simulation methods. In the case of military applications connected with the phenomena of gunshot and terminal ballistics it’s particularly important to develop a model of strength and armour penetration with KE projectile founded on reliable results of dynamic experiments and constituting the base for further analyses and optimization of projectile designs in order to achieve required penetration depth. Static and dynamic results of strength investigations of the EN AW-7012 aluminium alloy (sabot) and tungsten alloy (penetrator) are discussed in this paper. Static testing was carried out with the INSTRON testing machine. Dynamic tests have been conducted using the split Hopkinson pressure bars technique at strain rates up to 1,2 ⋅ 104s−1 (for aluminium alloy) and 6 ⋅ 103s−1 (for tungsten alloy).
Highlights
The subcalibre kinetic energy (KE) projectile is the most advanced and complicated in design engineering type of artillery ammunition
The sabot transfers the pressure of the gunpowder combustion products on the lateral surface of the rod penetrator in order to increase its muzzle velocity, and thereby it causes increase of the impact velocity of the rod penetrator in the target
The rod penetrator and sabot are dynamically loaded by the pressure of the combustion products of the gunpowder and the inertial forces, which are generated by the projectile acceleration in the gun barrel during firing
Summary
The subcalibre kinetic energy (KE) projectile is the most advanced and complicated in design engineering type of artillery ammunition. The modern subcalibre projectiles experiences a pressure over 400 MPa and an extremely high acceleration about 70 000 g For this reasons ensuring in-bore the correct working of the projectile under such extremely dynamic loads becomes a difficult strength problem The main aim of studies on dynamic behaviour of construction materials at high strain rates is to determine the variation of mechanical properties (strength, plasticity) in function of the strain rate and temperature. By using testing machines of special design it is possible to determine the mechanical parameters of material for strain rate about 200 s−1. Dynamic tests have been realized using the split Hopkinson pressure bar (SHPB) technique at strain rates up to1,2 · 104 s−1 (for aluminium alloy) and 6·103 s−1 (for tungsten alloy). It’s necessary to mention that authors didn’t find in the accessible literature static and dynamic properties of similar structural materials tested here used in the military armament technology
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